稀土元素与3,4-二羟基苯甲醛缩邻氨基苯甲酸配合物的合成和表征

SYNTHESIS AND CHARACTERIZATION OF LANTHANIDE COMPLEXES WITH THE SCHIFF BASE N-(3,4-DIHYDROXYBENZALIDENE)ANTHRANILIC ACID

本文在三乙胺存在下合成了3,4-二羟基苯甲醛缩邻氨基苯甲酸(H_3L)与稀土元素的配合物。元素分析和摩尔电导值等确定其组成为[REL·nH_2O],(RE=La、Pr、Nd、Sm,n=3;RE=Gd、Dy、Ho、Yb、Y,n=4)。钆和钇配合物皆属重稀土组。磁化率、TG-DTA、IR和NMR等结果表明,配合物中不含硝酸根离子,负三价的配体离子以一种“扭曲”的形式与稀土离子配位。

A Schiff base(H_3L) has been obtained by the reaction of 3,4-dihydroxybenzaldehyde with anthranilic acid in ethyl alcohol. Nine complexes of this Schiff base with lanthanide ions have been synthesized in the presence of triethylamine. Elemental analysis and conductance measurements show that the complexes have the general formula of RE(L)nH_2O, (RE=La,Pr,Nd,Sm,n=3;RE=Gd,Dy, Ho, Yb, Y,n=4), both Gd and Y complexes belong to that with heavier REs. No nitrate was found in the complexes. The complexes were characterized by magnetic susceptibility, TG-DTA, IR spectra and NMR measurements. The Ligand, which acts as quadriderntate, coordinates with RE(Ⅲ)in 'gauche' form.